<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ page isErrorPage="true" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
<p>当前错误
    <%= exception.getMessage()%>
</p>

<%=session.getAttribute("sessionKey")%>
<%=pageContext.getAttribute("sessionKey",3)%>
</body>
</html>
